Source : Webster's Revised Unabridged Dictionary (1913)

Furring \Fur"ring\, n.
   1. (Carp.)
      (a) The leveling of a surface, or the preparing of an air
          space, by means of strips of board or of larger
          pieces. See {Fur}, v. t., 3.
      (b) The strips thus laid on.

   2. (Shipbuilding) Double planking of a ship's side.

   3. A deposit from water, as on the inside of a boiler; also,
      the operation of cleaning away this deposit.

Fur \Fur\, v. t. [imp. & p. p. {Furred}; p. pr. & vb. n.
   {Furring}.]
   1. To line, face, or cover with fur; as, furred robes. ``You
      fur your gloves with reason.'' --Shak.

   2. To cover with morbid matter, as the tongue.

   3. (Arch.) To nail small strips of board or larger scantling
      upon, in order to make a level surface for lathing or
      boarding, or to provide for a space or interval back of
      the plastered or boarded surface, as inside an outer wall,
      by way of protection against damp. --Gwill.

Source : WordNet®

furring
     See {fur}

fur
     n 1: the dressed hairy coat of a mammal [syn: {pelt}]
     2: dense coat of fine silky hairs on mammals (e.g., cat or seal
        or weasel)
     3: a garment made of fur
     [also: {furring}, {furred}]

furring
     n 1: a furlike coating of matter as on the tongue
     2: strip used to give a level surface for attaching wallboard
        [syn: {furring strip}]